Vendetta Online is a multi-platform 3D space-combat MMO for Windows, Mac, Linux/32 and Linux/64. The game permits players to interact in a vast online galaxy; fighting, trading, and mining their way to success. A "twitch" type real-time combat model makes true player skill the deciding factor instead of character advancement. Massive capital-ship battles shake the foundations of the major nations at war, while others struggle to push back the encroachment of the AI "Hives". A no-strings free trial is available.

Doom was the classic 3D shoot'em'up game from id
Software. PrBoom is a game engine for playing Doom
levels, which runs on both Windows and Linux/Unix
systems. It uses the SDL graphics library. PrBoom
a very faithful Doom port, with great effort taken
to be compatible with as many original Doom levels
and demos as possible.

The Castle is a first-person shooter game in a
dark fantasy setting. Your main weapon is a sword,
so the fight is mostly short-range. Three main
levels are included, packed with creatures, items,
and sounds. A couple of bonus levels are also
available, like the classic DOOM E1M1 level
reimplemented in VRML. The game engine is based on
VRML, OpenGL, OpenAL, and all shadows are done by
the shadow volumes approach.

ZDoom is an enhanced port of the official DOOM source. It features
support for all Hexen editing features (including ACS, hubs, etc.),
support for most BOOM editing features, freelook, jumping, and
translucency support, a Quake-style console, high screen resolutions,
removal of the original DOOM's limits, support for many more music
formats (including MOD, IT, XM, S3M, MIDI, MP3, and MUS), better mouse
support, UDP networking, and more.

GLOBE_3D is a real-time 3D engine. It features unconditionally portable sources (one set of sources for all platforms), real-time rendering (fast with a 3D hardware-accelerated graphics card), full eye movements and rotations, display of combinations of colors, materials, and textures, transparency, multiple area rendering with the portal technique (e.g. for inner scenes), collision detection, binary space partition (BSP), input-output of 3D objects or groups of objects linked to each other by portals, easy management of resources like textures (.bmp and .tga), BSP trees, and objects stored in .zip files, screenshots (.bmp) and video captures (.avi), multi-view support, and vectorized geometry support.

Quake 2 Map Info is a command line utility that parses a Quake 2 map file and reports how many entities and textures are being used. It is useful for spotting extra items to improve gameplay balance and/or reducing extra textures to increase map speed. Most map editors do not provide a detailed breakdown of what is inside a map. It is compatible with any Quake 2 (ID Tech 2) game engine if the map file format has not be altered. If a game has a different map format, you can modify the source code to reflect the new format.

Q3utX Master Browser is an efficient Urban Terror
game servers browser. It interrogates a "Master
Browser" and retrieves all servers notified, then
shows all info about game servers through an Ajax
loader. It shows the server game name and type, IP
address and port, server engine, current map name,
number of users, and current players. It can
filter based on game type.

Mandingo (also known as UrT0) is a bot for the
Urban Terror chat system. It has a lot of features
and a complete administration backend that can be
used from a terminal oriented or via the MSN
Messenger protocol.

PrBoom-Plus is a modified PrBoom port with
uncapped framerate, variable gamespeed, re-record,
walkcam, chasecam, full mouselook, FOV, and other
features without loss of compatibility with the
original Doom.